| Standard label: | Guarantor Obligations [Line Items] |
| Name: | us-gaap:GuaranteeObligationsLineItems |
| Documentation: | Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |
| Object type: | cm:LineItems |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GuaranteeObligationsLineItems |
| Label | Role | Language |
| Guarantor Obligations [Line Items] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |